Comics and graphics artist Nate Hallinan has come up with an interesting series of artworks of the Marvel X-Men characters in an alternate, secondary world medievalish fantasy universe. It’s called, appropriately enough, Medieval X-Men: The Order of X.
Here is the one for Xavier. It looks very much like Patrick Stewart, who played Professor X in some of the X-Men films. The others, however, look rather different from their modern comics selves, with interesting results. He’s written up bios for these alternate characters. Definitely art worth checking out (he’s still working on the series.)